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Replace or Repair?

Hi There, I have an old Imperial Valet Contoller. It worked fine until last season when the sprinklers in the back yard stopped turning on. They worked fine in the front yard. I would rather fix this system than replace it. Can anyone tell me what might be happening?
Thanks so much[]

It sounds like the ground wire to the backyard is disconnected--
Sometimes the water supply to the backyard sprinkler valves gets turned off without you knowing about it. The controller itself is probably ok.